Periodex

General properties

Group

group 7

Period

period 4

Category

transition metals

Standard atomic weight

54.938 043(2)

Melting point

1519 K (1246 °C)

Boiling point

2334 K (2061 °C)

Phase at STP

solid

Additional properties

Block

d-block

Electron configuration

[Ar] 3d⁵ 4s²

Electrons per shell

2, 8, 13, 2

Electronegativity

1.55

Density

7.21 g/cm³

Oxidation states

−3, −2, −1, 0, +1, +2, +3, +4, +5, +6, +7

CAS Number

7439-96-5

Natural isotopes

Discovery history

Discovered by

Carl Wilhelm Scheele

Year of discovery

1774

Origin of name

Either the Latin 'magnes', meaning magnet or from the black magnesium oxide, 'magnesia nigra'